Authorities said an investigation was started in June after allegations surfaced of a sexual assault involving a 15-year-old girl.

The Lyon County Sheriff's Office asked the Iowa Division of Criminal Investigation to conduct the investigation.

Authorities said that the investigation revealed that on two occasions, the girl went on a ride-along with Lincecum while he was working as a deputy. On one of the ride-alongs, Lincecum had inappropriate sexual contact with the girl, authorities said.

Lincecum's employment with the Lyon County Sheriff’s Office ended in the spring of 2013 due to an unrelated matter.

Gen. David Petraeus pleaded guilty to federal charges Tuesday to end a probe into whether he provided classified information to his mistress when he was CIA director, according to a U.S. official briefed on the matter.